White light emitting device and method

• US 7,095,056 B2
• Filed: 12/01/2004
• Issued: 08/22/2006
• Est. Priority Date: 12/10/2003
• Status: Active Grant

• Current Assignee: Sensor Electronic Technology Incorporated (Seoul Semiconductor Co., Ltd.)
• Original Assignee: Sensor Electronic Technology Incorporated (Seoul Semiconductor Co., Ltd.)
• Inventors: Vitta, Pranciškus, Shur, Michael, Gaska, Remigijus, Zukauskas, Arturas
• Primary Examiner(s): Tran, Minhloan
• Assistant Examiner(s): LIU, BENJAMIN T
• Application Number:
  US11/001,304
• Publication Number:
  US 20050127381A1
• Time in Patent Office: 629 Days
• Field of Search: 257/88, 257/89, 257/98, 313501-504, 313485-487, 315/291, 315/179, 315/150, 327/514, 327/515
• US Class Current: 257/89
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/22 using optical feedback

Abstract

A white light emitting device and method that generate light by combining light produced by a white light source with light produced by at least one supplemental light emitting diode (LED). The supplemental light can be used to adjust one or more properties of the generated light. Adjustments can be made to the generated light based on feedback.

Claims

1. A device for generating light, the device comprising:

a white light emitting diode (LED);

a first supplemental LED that produces cyan light; and

a second supplemental LED that produces red light, wherein the light generated by the device comprises a combination of the light produced by the white LED, the first supplemental LED, and the second supplemental LED.

2. The device of claim 1, wherein the cyan light comprises a chromatic wavelength of approximately 506 nanometers and the red light comprises a chromatic wavelength of approximately 641 nanometers.

3. The device of claim 1, wherein the light produced by the white LED comprises a color temperature of approximately 6725 K.

4. The device of claim 1, further comprising an adjustment system for adjusting at least one property of the generated light.

5. The device of claim 4, wherein the at least one property comprises at least one of:

a color temperature, an efficiency, a luminous flux, and a color rendering.

6. The device of claim 4, wherein the adjustment system includes a computer program product comprising a computer useable medium having computer readable program code embodied therein for automatically adjusting the at least one property of the generated light.

7. The device of claim 4, further comprising a feedback system for obtaining feedback on at least one of:

a color temperature, a luminous flux, and a color rendering for the generated light, wherein the adjusted at least one property of the generated light is based on the feedback.

8. The device of claim 1, further comprising a driver system for providing a driving current to at least one of:

the white LED, the first supplemental LED, and the second supplemental LED.

9. The device of claim 8, wherein the driver system alters a width of a driving pulse for the driving current.

10. The device of claim 1, wherein the white LED comprises at least one of:

a phosphor-conversion white LED or a multi-chip white LED.

11. A method of generating light, the method comprising:

producing white light using a white light emitting diode (LED);

producing a first supplemental light using a first supplemental LED that produces cyan light;

producing a second supplemental light using a second supplemental LED that produces red light; and

combining the white light, the first supplemental light, and the second supplemental light.

12. The method of claim 11, further comprising adjusting at least one property of the generated light.

13. The method of claim 12, wherein the adjusting step includes altering a driving current of at least one of:

the white LED and the first supplemental LED.

14. The method of claim 12, wherein the at least one property comprises at least one of:

a color temperature, an efficiency, a luminous flux, and a color rendering.

15. The method of claim 11, further comprising obtaining feedback based on the generated light.

16. A device for generating light, the device comprising:

a white light source;

a first supplemental light emitting diode (LED) that produces cyan light; and

a second supplemental LED tat produces red light, wherein the light emitted from the device comprises a combination of the light produced by the white light source, the first supplemental LED, and the second supplemental LED.

17. The device of claim 16, wherein the white light source comprises at least one of:

a phosphor-conversion LED, an incandescent light bulb, a gas discharge tube, and a fluorescent tube.

18. The device of claim 16, further comprising a driver system for altering a driving current of at least one of:

the white light source, the first supplemental LED, and the second supplemental LED.

19. The device of claim 16, further comprising a feedback system for obtaining feedback on at least one of:

a color temperature, a luminous flux, and a color rendering index for the generated light.

20. The device of claim 16, further comprising an adjustment system for adjusting at least one property of the generated light.